/* ============================================================
   Lumen · 看清 — 设计系统
   主题:黑暗里的一束光。给币圈新人照清脚下的路。
   3 色系统:墨夜(ink) + 蜜光(lumen amber) + 纸白(paper)
   + 功能语义色:safe 绿 / danger 红 / note 蓝灰
   ============================================================ */

:root {
  /* —— 墨夜 ink —— */
  --ink-900: #0e0f15;
  --ink-800: #14161f;
  --ink-700: #1c1f2b;
  --ink-600: #2a2e3d;
  --ink-500: #3b4154;

  /* —— 纸白 paper —— */
  --paper:    #fbf9f4;
  --paper-2:  #f4f1e9;
  --white:    #ffffff;

  /* —— 蜜光 lumen amber(品牌识别 / 引导)—— */
  --lumen-700: #b9740a;
  --lumen-600: #e0890c;
  --lumen-500: #f5a623;
  --lumen-400: #ffbd4d;
  --lumen-300: #ffd98a;
  --lumen-glow: rgba(245,166,35,.40);

  /* —— 文字 —— */
  --tx:      #1b1d27;
  --tx-soft: #4b4f5e;
  --tx-mut:  #74798a;
  --tx-inv:  #f3f1ea;
  --tx-inv-soft: #b7bccb;

  /* —— 功能语义 —— */
  --safe:   #1f9d63;
  --safe-bg:#e7f6ee;
  --danger: #d23b3b;
  --danger-bg:#fcebea;
  --note:   #3563b0;
  --note-bg:#eaf1fb;
  --warn:   #c98202;
  --warn-bg:#fdf3df;

  /* —— 线 / 面 —— */
  --line:   #e7e2d6;
  --line-2: #d9d3c3;
  --card:   #ffffff;

  /* —— 阴影 4 档 —— */
  --sh-xs: 0 1px 2px rgba(20,22,31,.05);
  --sh-sm: 0 2px 8px rgba(20,22,31,.07);
  --sh-md: 0 8px 28px rgba(20,22,31,.10);
  --sh-lg: 0 22px 60px rgba(20,22,31,.16);
  --sh-glow: 0 0 0 1px rgba(245,166,35,.18), 0 10px 40px rgba(245,166,35,.16);

  /* —— 字体 —— */
  --serif: "Noto Serif SC", "Songti SC", "STSong", Georgia, "Times New Roman", serif;
  --sans:  -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
           "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono:  "SF Mono", "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;

  /* —— 尺度 —— */
  --wrap: 1140px;
  --wrap-narrow: 760px;
  --radius: 14px;
  --radius-sm: 9px;
  --radius-lg: 22px;
  --gap: clamp(16px, 3vw, 28px);

  --ease: cubic-bezier(.22,.61,.36,1);
}

/* ============================================================
   Reset / base
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 88px;
}
body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--tx);
  line-height: 1.75;
  font-size: 17px;
  letter-spacing: .005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg, video { max-width: 100%; height: auto; display: block; }
a { color: var(--lumen-700); text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--lumen-600); }
ul, ol { padding-left: 1.3em; }
strong, b { font-weight: 700; color: var(--tx); }
/* 暗场容器里的 strong 不能用深色(否则黑底看不见) */
.hero strong, .section.ink strong, .section.ink b, .cta-block strong, .cta-block b, .on-dark strong, .on-dark b { color: #fff; }
.hero-sub strong { color: var(--lumen-300); }
mark, .hl {
  background: linear-gradient(180deg, transparent 58%, var(--lumen-300) 58%);
  color: inherit; padding: 0 .12em; border-radius: 2px;
}
::selection { background: var(--lumen-300); color: var(--ink-900); }

h1, h2, h3, h4 { font-family: var(--serif); font-weight: 700; line-height: 1.28; color: var(--tx); letter-spacing: -.01em; }

.wrap { max-width: var(--wrap); margin-inline: auto; padding-inline: clamp(18px, 5vw, 36px); }
.narrow { max-width: var(--wrap-narrow); }
.muted { color: var(--tx-mut); }
.center { text-align: center; }
.nowrap { white-space: nowrap; }

/* skip link a11y */
.skip { position:absolute; left:-999px; top:0; background:var(--ink-900); color:#fff; padding:10px 16px; z-index:200; border-radius:0 0 8px 0; }
.skip:focus { left:0; }

/* ============================================================
   顶部披露条(affiliate disclosure)
   ============================================================ */
.disclosure-bar {
  background: var(--ink-900);
  color: var(--tx-inv-soft);
  font-size: 13px;
  text-align: center;
  padding: 7px 16px;
  line-height: 1.5;
}
.disclosure-bar b { color: var(--lumen-400); font-weight: 600; }
.disclosure-bar a { color: var(--lumen-300); border-bottom: 1px dotted rgba(255,217,138,.5); }

/* ============================================================
   Header / Nav
   ============================================================ */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(251,249,244,.82);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; gap: 18px;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 11px; margin-right: auto; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 9px; flex: none;
  background: radial-gradient(circle at 50% 38%, var(--lumen-400), var(--lumen-600) 62%, var(--lumen-700));
  box-shadow: 0 0 0 1px rgba(185,116,10,.25), 0 6px 16px var(--lumen-glow);
  position: relative;
}
.brand-mark::after {
  content:""; position:absolute; inset:0; border-radius:9px;
  background: radial-gradient(circle at 50% 30%, rgba(255,255,255,.85), transparent 45%);
}
.brand-name { font-family: var(--serif); font-weight: 800; font-size: 21px; color: var(--ink-900); letter-spacing: 0; }
.brand-name .zh { color: var(--lumen-700); }
.brand-tag { font-size: 11.5px; color: var(--tx-mut); margin-top: -3px; letter-spacing: .22em; }

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  color: var(--tx-soft); font-size: 15px; font-weight: 500;
  padding: 8px 13px; border-radius: 8px; transition: all .18s var(--ease);
}
.nav-links a:hover { color: var(--ink-900); background: var(--paper-2); }
.nav-links a.is-cta {
  background: var(--ink-900); color: #fff; margin-left: 6px;
}
.nav-links a.is-cta:hover { background: var(--lumen-700); color:#fff; }

/* —— 语种切换器(autonym 下拉 · 右上角悬停/点击展开)—— */
.lang-switch { position: relative; }
.lang-switch-btn {
  font: inherit; cursor: pointer; color: var(--tx-soft);
  background: none; border: 1px solid var(--line-2);
  border-radius: 8px; padding: 7px 11px; font-size: 14.5px; font-weight: 500;
  display: inline-flex; align-items: center; gap: 6px; transition: all .18s var(--ease);
}
.lang-switch-btn::after { content: "▾"; font-size: 11px; opacity: .7; }
.lang-switch-btn:hover, .lang-switch.open .lang-switch-btn { color: var(--ink-900); border-color: var(--lumen-500); }
.lang-switch-menu {
  position: absolute; top: calc(100% + 9px); right: 0; min-width: 172px;
  list-style: none; margin: 0; padding: 6px;
  background: var(--paper); border: 1px solid var(--line);
  border-radius: 12px; box-shadow: 0 14px 34px rgba(14,15,21,.18);
  opacity: 0; visibility: hidden; transform: translateY(-7px);
  transition: opacity .16s var(--ease), transform .16s var(--ease), visibility .16s;
  z-index: 120;
}
.lang-switch:hover .lang-switch-menu,
.lang-switch:focus-within .lang-switch-menu,
.lang-switch.open .lang-switch-menu { opacity: 1; visibility: visible; transform: none; }
.lang-switch-menu a { display: block; padding: 9px 12px; border-radius: 8px; color: var(--tx); font-size: 15px; font-weight: 500; }
.lang-switch-menu a:hover { background: var(--paper-2); color: var(--ink-900); }
.lang-switch-menu a[aria-current="true"] { color: var(--lumen-700); font-weight: 700; }
@media (max-width: 880px) {
  .lang-switch { width: 100%; margin-top: 6px; }
  .lang-switch-btn { width: 100%; justify-content: space-between; }
  .lang-switch-menu { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: none; background: var(--paper-2); margin-top: 6px; }
}

.nav-toggle { display: none; background: none; border: 1px solid var(--line-2); border-radius: 9px; width: 42px; height: 42px; cursor: pointer; align-items: center; justify-content: center; }
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content:""; display:block; width: 19px; height: 2px; background: var(--ink-800); border-radius: 2px; transition: .25s var(--ease); position: relative;
}
.nav-toggle span::before { position:absolute; top:-6px; }
.nav-toggle span::after  { position:absolute; top: 6px; }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { top:0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after  { top:0; transform: rotate(-45deg); }

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; justify-content:center; gap: 9px;
  font-family: var(--sans); font-weight: 650; font-size: 16px;
  padding: 14px 26px; border-radius: 11px; border: 1px solid transparent;
  cursor: pointer; transition: all .2s var(--ease); min-height: 48px;
  text-align:center; line-height: 1.2;
}
.btn-lg { padding: 17px 34px; font-size: 17.5px; min-height: 56px; }
.btn-primary {
  background: linear-gradient(180deg, var(--lumen-500), var(--lumen-600));
  color: #2a1a02; box-shadow: 0 8px 22px var(--lumen-glow), inset 0 1px 0 rgba(255,255,255,.35);
  position: relative; overflow: hidden;
}
.btn-primary::after {
  content:""; position:absolute; top:0; left:-120%; width: 60%; height:100%;
  background: linear-gradient(100deg, transparent, rgba(255,255,255,.55), transparent);
  transition: left .6s var(--ease);
}
.btn-primary:hover { color:#2a1a02; transform: translateY(-2px); box-shadow: 0 12px 30px var(--lumen-glow); }
.btn-primary:hover::after { left: 130%; }
.btn-ghost {
  background: transparent; color: var(--ink-900); border-color: var(--line-2);
}
.btn-ghost:hover { color: var(--ink-900); border-color: var(--ink-800); background: rgba(0,0,0,.02); transform: translateY(-2px); }
/* 暗场里的 ghost 按钮(hero 等)文字必须是浅色 */
.hero .btn-ghost { color: #fff; border-color: rgba(255,255,255,.30); }
.hero .btn-ghost:hover { color: #fff; background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.55); }
.btn-onlight-ghost { background:#fff; color: var(--ink-900); border-color: var(--line-2); box-shadow: var(--sh-xs); }
.btn-onlight-ghost:hover { color: var(--ink-900); border-color: var(--lumen-600); transform: translateY(-2px); }
/* dark-section ghost */
.on-dark .btn-ghost { color:#fff; border-color: rgba(255,255,255,.28); }
.on-dark .btn-ghost:hover { color:#fff; background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.5); }

/* ============================================================
   Hero — 暗场路灯光晕
   ============================================================ */
.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(60% 75% at 50% -8%, rgba(245,166,35,.22), transparent 60%),
    linear-gradient(180deg, var(--ink-900), var(--ink-800) 70%, var(--ink-700));
  color: var(--tx-inv);
  padding: clamp(64px, 11vw, 128px) 0 clamp(58px, 9vw, 104px);
}
.hero::before { /* 光柱 */
  content:""; position:absolute; left:50%; top:-40%; transform: translateX(-50%);
  width: 120%; height: 120%;
  background: radial-gradient(38% 50% at 50% 30%, var(--lumen-glow), transparent 70%);
  filter: blur(8px); pointer-events:none; opacity:.9;
}
.hero::after { /* 细颗粒地面 */
  content:""; position:absolute; inset:0; pointer-events:none;
  background-image: radial-gradient(rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 4px 4px; opacity:.5;
}
.hero .wrap { position: relative; z-index: 2; }
.hero-eyebrow {
  display:inline-flex; align-items:center; gap:8px;
  font-size: 13px; letter-spacing: .14em; text-transform: uppercase;
  color: var(--lumen-300); border:1px solid rgba(255,217,138,.28);
  padding: 6px 14px; border-radius: 999px; background: rgba(245,166,35,.07);
  margin-bottom: 26px;
}
.hero-eyebrow .dot { width:7px;height:7px;border-radius:50%; background: var(--lumen-400); box-shadow:0 0 10px var(--lumen-400); }
.hero h1 {
  color: #fff; font-size: clamp(32px, 6vw, 60px); line-height: 1.12;
  letter-spacing: -.02em; max-width: 16ch;
}
.hero h1 .glow { color: var(--lumen-400); text-shadow: 0 0 30px var(--lumen-glow); }
.hero-sub {
  margin-top: 22px; font-size: clamp(16.5px, 2.2vw, 20px); color: var(--tx-inv-soft);
  max-width: 52ch; line-height: 1.7;
}
.hero-cta { margin-top: 38px; display:flex; flex-wrap: wrap; gap: 14px; align-items:center; }
.hero-note { margin-top: 18px; font-size: 13.5px; color: var(--tx-inv-soft); display:flex; align-items:center; gap:8px; flex-wrap:wrap; }
.hero-note code { background: rgba(255,255,255,.08); color: var(--lumen-300); padding: 2px 9px; border-radius: 6px; font-family: var(--mono); font-size: 13px; }
.hero-trust { margin-top: 40px; display:flex; flex-wrap:wrap; gap: 26px 34px; padding-top: 26px; border-top: 1px solid rgba(255,255,255,.10); }
.hero-trust .item { display:flex; flex-direction:column; gap:2px; }
.hero-trust .k { font-family: var(--serif); font-size: 15px; color:#fff; font-weight: 700; }
.hero-trust .v { font-size: 13px; color: var(--tx-inv-soft); }
/* hero 双栏:文案左 + 路灯主视觉右 */
.hero-grid { display:grid; grid-template-columns: 1.05fr .82fr; gap: clamp(30px,5vw,66px); align-items:center; }
.hero-copy { min-width:0; }
.hero-visual { margin:0; position:relative; }
.hero-visual::before { content:""; position:absolute; inset:-12% -8%; background: radial-gradient(50% 42% at 56% 30%, var(--lumen-glow), transparent 70%); filter: blur(10px); z-index:0; }
.hero-visual img { position:relative; z-index:1; width:100%; border-radius: var(--radius-lg); border:1px solid rgba(255,255,255,.12); box-shadow: 0 34px 80px rgba(0,0,0,.55), 0 0 0 1px rgba(245,166,35,.10); }
@media (max-width: 940px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
}

/* ============================================================
   Section scaffolding
   ============================================================ */
.section { padding: clamp(54px, 8vw, 92px) 0; }
.section.alt { background: var(--paper-2); }
.section.ink { background: linear-gradient(180deg, var(--ink-800), var(--ink-900)); color: var(--tx-inv); }
.section-head { max-width: 64ch; margin-bottom: clamp(30px, 5vw, 52px); }
.section-head.center { margin-inline:auto; }
.kicker {
  font-size: 13px; font-weight: 700; letter-spacing: .15em; text-transform: uppercase;
  color: var(--lumen-700); display:inline-flex; align-items:center; gap:9px; margin-bottom: 14px;
}
.kicker::before { content:""; width: 26px; height:2px; background: var(--lumen-500); border-radius:2px; }
.section.ink .kicker { color: var(--lumen-400); }
.section h2 { font-size: clamp(25px, 4vw, 38px); }
.section .lead { margin-top: 14px; font-size: clamp(16px, 2vw, 18.5px); color: var(--tx-soft); }
.section.ink .lead { color: var(--tx-inv-soft); }

/* ============================================================
   3 支柱卡
   ============================================================ */
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--gap); }
.pillar {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 26px; box-shadow: var(--sh-sm); position: relative; overflow: hidden;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}
.pillar::before {
  content:""; position:absolute; top:0; left:0; right:0; height:3px;
  background: linear-gradient(90deg, var(--lumen-500), var(--lumen-300));
  transform: scaleX(0); transform-origin: left; transition: transform .3s var(--ease);
}
.pillar:hover { transform: translateY(-5px); box-shadow: var(--sh-md); border-color: var(--line-2); }
.pillar:hover::before { transform: scaleX(1); }
.pillar .ic {
  width: 50px; height: 50px; border-radius: 13px; display:flex; align-items:center; justify-content:center;
  background: var(--lumen-glow); margin-bottom: 18px; font-size: 24px;
}
.pillar h3 { font-size: 20px; margin-bottom: 9px; }
.pillar p { color: var(--tx-soft); font-size: 15.5px; }
.pillar ul { margin-top: 14px; list-style:none; padding:0; }
.pillar ul li { font-size: 14.5px; color: var(--tx-soft); padding: 5px 0 5px 22px; position: relative; }
.pillar ul li::before { content:"→"; position:absolute; left:0; color: var(--lumen-600); font-weight:700; }

/* ============================================================
   文章卡片(杂志感)
   ============================================================ */
.card-grid { display:grid; grid-template-columns: repeat(3,1fr); gap: var(--gap); }
.card-grid.two { grid-template-columns: repeat(2,1fr); }
.acard {
  display:flex; flex-direction:column; background: var(--card);
  border:1px solid var(--line); border-radius: var(--radius); overflow:hidden;
  box-shadow: var(--sh-xs); transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .2s;
}
.acard:hover { transform: translateY(-5px); box-shadow: var(--sh-md); border-color: var(--line-2); }
.acard .body { padding: 24px 24px 26px; display:flex; flex-direction:column; flex:1; }
.acard .tag {
  align-self:flex-start; font-size: 12px; font-weight: 700; letter-spacing:.04em;
  padding: 4px 11px; border-radius: 999px; margin-bottom: 14px;
}
.tag-safe   { background: var(--safe-bg);   color: var(--safe); }
.tag-danger { background: var(--danger-bg); color: var(--danger); }
.tag-note   { background: var(--note-bg);   color: var(--note); }
.tag-warn   { background: var(--warn-bg);   color: var(--warn); }
.tag-core   { background: var(--ink-900);   color: var(--lumen-300); }
.acard h3 { font-size: 19.5px; line-height: 1.35; margin-bottom: 10px; }
.acard h3 a { color: var(--tx); }
.acard:hover h3 a { color: var(--lumen-700); }
.acard p { color: var(--tx-soft); font-size: 15px; flex:1; }
.acard .meta { margin-top: 18px; display:flex; align-items:center; gap: 12px; font-size: 13px; color: var(--tx-mut); }
.acard .meta .read::before { content:"·"; margin-right:12px; }
.acard .more { margin-top: 16px; font-weight: 650; font-size: 14.5px; color: var(--lumen-700); display:inline-flex; align-items:center; gap:6px; }
.acard:hover .more { gap: 10px; }

/* ============================================================
   Callout 提示框(安全主题语义)
   ============================================================ */
.callout {
  border-radius: var(--radius-sm); padding: 18px 20px 18px 52px; position: relative;
  margin: 26px 0; font-size: 15.5px; line-height: 1.7; border:1px solid;
}
.callout::before { position:absolute; left:18px; top:17px; font-size: 19px; line-height:1; }
.callout p:last-child { margin-bottom:0; }
.callout .t { font-weight:700; display:block; margin-bottom:4px; }
.callout-danger { background: var(--danger-bg); border-color: #f3c9c7; color: #7c1f1f; }
.callout-danger::before { content:"⚠"; color: var(--danger); }
.callout-safe   { background: var(--safe-bg);  border-color: #b9e3cc; color: #11532f; }
.callout-safe::before { content:"✓"; color: var(--safe); }
.callout-note   { background: var(--note-bg);  border-color: #c7d9f3; color: #1e3c6e; }
.callout-note::before { content:"ℹ"; color: var(--note); }
.callout-warn   { background: var(--warn-bg);  border-color: #f0dcab; color: #7a5102; }
.callout-warn::before { content:"!"; color: var(--warn); font-weight:800; }

/* 编辑组实测段 */
.handson {
  background: linear-gradient(180deg, #fff, var(--paper-2));
  border: 1px solid var(--line-2); border-left: 4px solid var(--lumen-500);
  border-radius: var(--radius-sm); padding: 20px 22px; margin: 28px 0;
}
.handson .label { font-size: 13px; font-weight: 700; color: var(--lumen-700); letter-spacing:.03em; display:flex; align-items:center; gap:9px; margin-bottom:8px; }
.handson .label::before { content:""; width:16px; height:16px; flex:none; border-radius:4px; background: var(--lumen-500); box-shadow: inset 0 0 0 2px rgba(255,255,255,.55); }
.handson p { font-size: 15.5px; color: var(--tx-soft); }

/* ============================================================
   正文 inline 桥接段(affiliate)
   ============================================================ */
.bridge {
  border-left: 4px solid var(--lumen-500); background: var(--paper-2);
  padding: 18px 22px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 30px 0; font-size: 15.5px;
}
.bridge a.inline-cta { font-weight: 700; color: var(--lumen-700); border-bottom: 2px solid var(--lumen-300); }
.bridge a.inline-cta:hover { border-color: var(--lumen-500); }

/* ============================================================
   文末 CTA 块(暗场)
   ============================================================ */
.cta-block {
  background:
    radial-gradient(70% 120% at 80% 0%, rgba(245,166,35,.16), transparent 55%),
    linear-gradient(160deg, var(--ink-800), var(--ink-900));
  color:#fff; border-radius: var(--radius-lg); padding: clamp(30px,5vw,48px);
  position: relative; overflow:hidden; box-shadow: var(--sh-lg);
}
.cta-block::before {
  content:""; position:absolute; right:-60px; top:-60px; width:240px; height:240px;
  background: radial-gradient(circle, var(--lumen-glow), transparent 70%); filter: blur(10px);
}
.cta-block .inner { position: relative; z-index:2; max-width: 60ch; }
.cta-block h2, .cta-block h3 { color:#fff; font-size: clamp(22px,3.4vw,30px); }
.cta-block p { color: var(--tx-inv-soft); margin-top: 12px; font-size: 16px; }
.cta-block .hero-cta { margin-top: 26px; }
.cta-block .codeline { margin-top:16px; font-size:13.5px; color:var(--tx-inv-soft); }
.cta-block .codeline code { background: rgba(255,255,255,.1); color: var(--lumen-300); padding:2px 9px; border-radius:6px; font-family:var(--mono); }
.cta-block .fineprint { margin-top: 16px; font-size: 12.5px; color: rgba(183,188,203,.7); }

/* ============================================================
   文章页排版 + sticky TOC 双栏
   ============================================================ */
.article-head {
  background: linear-gradient(180deg, var(--paper-2), var(--paper));
  border-bottom: 1px solid var(--line); padding: clamp(34px,6vw,60px) 0 clamp(28px,4vw,40px);
}
.breadcrumb { font-size: 13.5px; color: var(--tx-mut); margin-bottom: 18px; display:flex; flex-wrap:wrap; gap:7px; align-items:center; }
.breadcrumb a { color: var(--tx-mut); }
.breadcrumb a:hover { color: var(--lumen-700); }
.breadcrumb .sep { color: var(--line-2); }
.article-head h1 { font-size: clamp(26px,4.6vw,42px); line-height:1.22; max-width: 22ch; }
.article-meta { margin-top: 18px; display:flex; flex-wrap:wrap; align-items:center; gap: 8px 16px; font-size: 14px; color: var(--tx-mut); }
.article-meta .by { color: var(--tx-soft); font-weight:600; }
.article-meta time { color: var(--tx-mut); }
.article-meta .badge { font-size:12px; background:var(--paper-2); border:1px solid var(--line); border-radius:999px; padding:3px 10px; }

.article-layout {
  display:grid; grid-template-columns: minmax(0,1fr) 240px; gap: clamp(30px,5vw,64px);
  align-items: start; padding-block: clamp(36px,5vw,56px);
}
.toc {
  position: sticky; top: 88px; font-size: 14px; order: 2;
  border-left: 2px solid var(--line); padding-left: 18px; max-height: calc(100vh - 110px); overflow:auto;
}
.toc .toc-title { font-size: 12px; letter-spacing:.14em; text-transform:uppercase; color: var(--tx-mut); font-weight:700; margin-bottom: 12px; }
.toc ul { list-style:none; padding:0; margin:0; }
.toc li { margin: 2px 0; }
.toc a { color: var(--tx-soft); display:block; padding: 5px 8px; border-radius: 7px; line-height:1.4; transition: all .15s; border-left: 2px solid transparent; margin-left:-20px; padding-left:18px; }
.toc a:hover { color: var(--lumen-700); background: var(--paper-2); }
.toc a.active { color: var(--lumen-700); font-weight: 650; border-left-color: var(--lumen-500); background: var(--paper-2); }
.toc a.lv3 { padding-left: 28px; font-size: 13px; color: var(--tx-mut); }

.prose { order: 1; max-width: 100%; font-size: 17.5px; }
.prose > * + * { margin-top: 1.15em; }
.prose h2 { font-size: clamp(22px,3vw,29px); margin-top: 1.8em; padding-top: .3em; scroll-margin-top: 88px; }
.prose h2::before { content:""; display:block; width: 38px; height:3px; background: var(--lumen-500); border-radius:2px; margin-bottom: 16px; }
.prose h3 { font-size: clamp(19px,2.2vw,22px); margin-top: 1.5em; scroll-margin-top: 88px; }
.prose p { color: #25272f; }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li { margin: .5em 0; }
.prose li::marker { color: var(--lumen-600); }
.prose blockquote {
  border-left: 4px solid var(--lumen-400); background: var(--paper-2);
  padding: 14px 20px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--tx-soft); font-style: normal;
}
.prose blockquote p { color: var(--tx-soft); }
.prose code { background: var(--paper-2); padding: 2px 7px; border-radius: 5px; font-family: var(--mono); font-size: .88em; color: var(--lumen-700); border:1px solid var(--line); }
.prose figure { margin: 1.5em 0; }
.prose figure img { border-radius: var(--radius-sm); border:1px solid var(--line); box-shadow: var(--sh-sm); }
.prose figcaption { font-size: 13.5px; color: var(--tx-mut); text-align:center; margin-top: 10px; }
.article-cover { margin: 0 0 6px; }
.article-cover img { width:100%; border-radius: var(--radius); border:1px solid var(--line); box-shadow: var(--sh-sm); }

/* 数据表 */
.table-wrap { overflow-x:auto; margin: 24px 0; border:1px solid var(--line); border-radius: var(--radius-sm); }
table.data { width:100%; border-collapse: collapse; font-size: 15px; background:#fff; min-width: 460px; }
table.data th, table.data td { padding: 12px 16px; text-align:left; border-bottom:1px solid var(--line); }
table.data thead th { background: var(--ink-900); color: var(--tx-inv); font-weight:600; font-size: 14px; }
table.data tbody tr:nth-child(even) { background: var(--paper); }
table.data tbody tr:hover { background: var(--lumen-glow); }
table.data .ok { color: var(--safe); font-weight:700; }
table.data .no { color: var(--danger); font-weight:700; }

/* FAQ */
.faq { margin-top: 14px; }
.faq details {
  border:1px solid var(--line); border-radius: var(--radius-sm); margin-bottom: 12px; background:#fff;
  overflow: hidden; transition: box-shadow .2s;
}
.faq details[open] { box-shadow: var(--sh-sm); }
.faq summary {
  cursor:pointer; padding: 16px 50px 16px 20px; font-weight: 650; font-size: 16.5px; position: relative; list-style:none; color: var(--tx);
}
.faq summary::-webkit-details-marker { display:none; }
.faq summary::after {
  content:"+"; position:absolute; right:20px; top:50%; transform: translateY(-50%);
  font-size: 22px; color: var(--lumen-600); transition: transform .25s var(--ease); font-weight:400;
}
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq .faq-a { padding: 0 20px 18px; color: var(--tx-soft); font-size: 15.5px; }

/* 折叠工具说明(SEO Guide) */
.tool-guide-details { border:1px solid var(--line); border-radius: var(--radius-sm); background:#fff; margin-top: 28px; }
.tool-guide-details > summary { cursor:pointer; padding:16px 20px; font-weight:700; list-style:none; position:relative; color:var(--tx); }
.tool-guide-details > summary::-webkit-details-marker { display:none; }
.tool-guide-details > summary::before { content:"▶"; color: var(--lumen-600); font-size:12px; margin-right:10px; display:inline-block; transition: transform .2s; }
.tool-guide-details[open] > summary::before { transform: rotate(90deg); }
.tool-guide-details > summary:hover { color: var(--lumen-700); }
.tool-guide-body { padding: 0 22px 22px; }

/* key takeaways box(GEO 友好) */
.tldr {
  background: linear-gradient(180deg,#fff,var(--paper-2)); border:1px solid var(--line-2);
  border-radius: var(--radius); padding: 22px 24px; margin: 6px 0 8px;
}
.tldr .tldr-h { font-family:var(--serif); font-weight:800; font-size:16px; color:var(--ink-900); display:flex; align-items:center; gap:10px; margin-bottom:12px; }
.tldr .tldr-h::before { content:""; width:12px; height:12px; flex:none; border-radius:50%; background: radial-gradient(circle at 40% 35%, #ffd98a, #e0890c); box-shadow: 0 0 9px var(--lumen-glow); }
.tldr ul { margin:0; padding-left:1.2em; }
.tldr li { margin:7px 0; color: var(--tx-soft); font-size:15.5px; }

/* 文末作者署名 */
.byline-box { display:flex; gap:16px; align-items:flex-start; background:var(--paper-2); border:1px solid var(--line); border-radius:var(--radius); padding:22px 24px; margin-top:36px; }
.byline-box .avatar { width:52px;height:52px;border-radius:50%;flex:none; background: radial-gradient(circle at 40% 35%, var(--lumen-400), var(--lumen-700)); }
.byline-box .who { font-weight:700; color:var(--ink-900); }
.byline-box p { font-size:14px; color:var(--tx-soft); margin-top:4px; }

/* 相关文章 */
.related { margin-top: 44px; }
.related h3 { font-size: 19px; margin-bottom: 16px; }

/* ============================================================
   交互工具 UI(scam-check / readiness-check)
   ============================================================ */
.tool-shell { max-width: 720px; margin-inline:auto; }
.tool-card {
  background:#fff; border:1px solid var(--line); border-radius: var(--radius-lg);
  box-shadow: var(--sh-md); padding: clamp(24px,4vw,40px); position: relative; overflow:hidden;
}
.tool-progress { height: 8px; background: var(--paper-2); border-radius: 999px; overflow:hidden; margin-bottom: 28px; }
.tool-progress > i { display:block; height:100%; width:0; background: linear-gradient(90deg,var(--lumen-500),var(--lumen-400)); border-radius:999px; transition: width .4s var(--ease); }
.q-step { display:none; animation: fadeUp .4s var(--ease); }
.q-step.active { display:block; }
.q-count { font-size:13px; color:var(--tx-mut); letter-spacing:.08em; margin-bottom:10px; }
.q-title { font-family:var(--serif); font-size: clamp(20px,3vw,26px); line-height:1.35; margin-bottom: 22px; color:var(--ink-900); }
.q-opts { display:grid; gap: 12px; }
.q-opt {
  display:flex; align-items:center; gap:14px; text-align:left; width:100%;
  padding: 16px 18px; border:1.5px solid var(--line-2); border-radius: var(--radius);
  background:#fff; cursor:pointer; font-size: 16px; color: var(--tx); transition: all .18s var(--ease); font-family:var(--sans);
}
.q-opt:hover { border-color: var(--lumen-500); background: var(--paper); transform: translateX(3px); }
.q-opt.sel { border-color: var(--lumen-600); background: var(--lumen-glow); }
.q-opt .ck { width:24px;height:24px;border-radius:7px;border:2px solid var(--line-2); flex:none; display:flex;align-items:center;justify-content:center; transition:.18s; }
.q-opt.sel .ck { background: var(--lumen-600); border-color: var(--lumen-600); color:#fff; }
.q-nav { display:flex; justify-content:space-between; margin-top:26px; gap:12px; }
.tool-result { display:none; animation: fadeUp .5s var(--ease); }
.tool-result.show { display:block; }
.verdict { border-radius: var(--radius); padding: 24px; text-align:center; margin-bottom: 22px; }
.verdict .score { font-family:var(--serif); font-size: 46px; font-weight:800; line-height:1; }
.verdict .vt { font-size: 19px; font-weight:700; margin-top:8px; }
.verdict.lv-danger { background: var(--danger-bg); color:#7c1f1f; }
.verdict.lv-warn   { background: var(--warn-bg); color:#7a5102; }
.verdict.lv-safe   { background: var(--safe-bg); color:#11532f; }
.result-list { display:grid; gap:12px; }
.result-item { display:flex; gap:12px; align-items:flex-start; padding:14px 16px 14px 18px; border:1px solid var(--line); border-radius:var(--radius-sm); background:#fff; font-size:15px; line-height:1.65; }
.result-item.ri-warn { border-left: 3px solid var(--warn); }
.result-item.ri-safe { border-left: 3px solid var(--safe); }
.result-item .ic { flex:none; font-size:18px; }
.check-list { list-style:none; padding:0; display:grid; gap:10px; }
.check-item { display:flex; gap:14px; align-items:center; padding:14px 16px; border:1.5px solid var(--line-2); border-radius:var(--radius-sm); background:#fff; cursor:pointer; transition:.18s; }
.check-item:hover { border-color: var(--lumen-500); }
.check-item.done { border-color: var(--safe); background: var(--safe-bg); }
.check-item .box { width:24px;height:24px;border-radius:6px;border:2px solid var(--line-2); flex:none; display:flex;align-items:center;justify-content:center; font-size:15px; transition:.15s; }
.check-item.done .box { background: var(--safe); border-color: var(--safe); color:#fff; }
.check-item .tx { font-size:15.5px; color:var(--tx); }
.check-item.done .tx { color: #11532f; }

@keyframes fadeUp { from { opacity:0; transform: translateY(12px);} to {opacity:1; transform:none;} }

/* ============================================================
   Footer
   ============================================================ */
.site-footer { background: var(--ink-900); color: var(--tx-inv-soft); padding: clamp(46px,6vw,68px) 0 30px; font-size: 14.5px; }
.footer-top { display:grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 32px; }
.footer-brand .brand-name { color:#fff; }
.footer-brand p { margin-top:14px; color: var(--tx-inv-soft); max-width: 36ch; font-size: 14px; line-height:1.7; }
.footer-col h4 { color:#fff; font-family:var(--sans); font-size: 14px; letter-spacing:.04em; margin-bottom: 14px; }
.footer-col a { display:block; color: var(--tx-inv-soft); padding: 5px 0; font-size: 14px; }
.footer-col a:hover { color: var(--lumen-300); }
.footer-disclaimer {
  margin-top: 40px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.10);
  font-size: 13px; color: rgba(183,188,203,.78); line-height: 1.7;
}
.footer-disclaimer b { color: var(--lumen-300); }
.footer-bottom { margin-top: 18px; display:flex; flex-wrap:wrap; justify-content:space-between; gap:10px; font-size: 12.5px; color: rgba(183,188,203,.6); }

/* ============================================================
   Reveal 动效
   ============================================================ */
.reveal { opacity:0; transform: translateY(22px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.reveal.in { opacity:1; transform:none; }
.reveal.d1 { transition-delay:.08s; } .reveal.d2 { transition-delay:.16s; } .reveal.d3 { transition-delay:.24s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity:1; transform:none; transition:none; }
  html { scroll-behavior:auto; }
  .btn-primary::after { display:none; }
}

/* ============================================================
   文章页升级:阅读进度条 / 杂志导语 / 返回顶部
   ============================================================ */
.read-progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0; z-index: 200;
  background: linear-gradient(90deg, var(--lumen-600), var(--lumen-400));
  box-shadow: 0 0 10px var(--lumen-glow); transition: width .12s linear;
}
/* 封面后第一段 = 杂志导语,字号略大、更舒展 */
.prose .article-cover + p { font-size: 1.16em; line-height: 1.85; color: #2a2c36; }
.to-top {
  position: fixed; right: clamp(16px,3vw,28px); bottom: clamp(18px,4vh,28px);
  width: 46px; height: 46px; border-radius: 50%; background: var(--ink-900); color: #fff;
  border: 1px solid rgba(255,255,255,.14); display: flex; align-items: center; justify-content: center;
  cursor: pointer; opacity: 0; transform: translateY(14px); pointer-events: none;
  transition: opacity .3s var(--ease), transform .3s var(--ease), background .2s; z-index: 95; box-shadow: var(--sh-md);
}
.to-top.show { opacity: 1; transform: none; pointer-events: auto; }
.to-top:hover { background: var(--lumen-700); transform: translateY(-2px); }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 940px) {
  .pillars, .card-grid, .card-grid.two { grid-template-columns: 1fr 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 28px; }
  .article-layout { grid-template-columns: 1fr; }
  .toc { position: static; max-height:none; order:0; border-left:none; border:1px solid var(--line); border-radius:var(--radius-sm); padding:16px 18px; margin-bottom: 8px; background:#fff; }
  .toc { display:none; } /* 移动端默认收起,文章页可用 details 包裹 */
}
@media (max-width: 720px) {
  body { font-size: 16.5px; }
  .nav-links {
    position: fixed; inset: 64px 0 auto 0; flex-direction: column; align-items: stretch;
    background: var(--paper); border-bottom:1px solid var(--line); padding: 12px 18px 20px;
    gap: 2px; box-shadow: var(--sh-md); transform: translateY(-130%); transition: transform .3s var(--ease); z-index: 99;
  }
  .nav-links.open { transform: none; }
  .nav-links a { padding: 13px 14px; font-size: 16px; }
  .nav-links a.is-cta { margin: 8px 0 0; text-align:center; }
  .nav-toggle { display:flex; }
  .pillars, .card-grid, .card-grid.two { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .hero-cta .btn { width: 100%; }
  .hero-trust { gap: 18px 26px; }
}
@media (max-width: 460px) {
  .footer-top { grid-template-columns: 1fr; }
}